package manager.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class CheckLogin
 */
public class CheckLogin implements Filter {

    /**
     * Default constructor. 
     */
    public CheckLogin() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		HttpServletRequest req=(HttpServletRequest)request;//向下转型
		HttpSession ses=req.getSession();//取得Session
		if(ses.getAttribute("user")!=null){//判断是否登录
			chain.doFilter(request,response);
		}else{
			HttpServletResponse  res = (HttpServletResponse)response;
			res.sendRedirect("/manager/index.html");
		}	
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
